AS17231 199.107.64.0/21 CIDR and IP Range Summary.ASN: 17231 - AT&T Enhanced Network ServicesHost Count: 2046Addressable IPs: 2048199.107.64.0/24199.107.65.0/24199.107.66.0/24199.107.67.0/24199.107.68.0/24199.107.69.0/24199.107.70.0/24199.107.71.0/24